Brush rigging



y 1943- L. HAIFLEY ET AL 2,324,299

BRUSH RIGGING Filed Oct. 14, 1942 Fjg/ Invehtor's Lerog Han leg,

Lawrence F Hemphill,

Then- Attornea.

Patented July 13, 1943 BRUSH RIGGING Leroy Haifley and Lawrence F. Hemphill, Fort Wayne, Ind, assignors to General Electric Company. a corporation of New York Application October 14, 1942, Serial No. 461,963

7 Claims.

Our invention relates to dynamo-electric machine brush rigging supporting structures and may also be used for supporting other parts of dynamo-electric machines.

An object of our invention is to provide an improved and simplified brush rigging for a dynamo-electric machine,

Another object of our invention is to provide an improved brush rigging supporting structure for a dynamo-electric machine.

A further object of our invention is to provide a supporting structure for a dynamo-electric machine member.

Further objects and advantages of our invention will be better understood from the following description referring to the accompanying drawing, and the features of novelty which characterize our invention will be pointed out with particularity in the claims annexed to and forming part of this specification.

In the drawing Fig. l is a partial side elevational view of a dynamo-electric machine, partly broken away to illustrate an embodiment of our invention; Fig. 2 is a sectional view of our improved brush rigging supporting structure, taken along line 2-2 of Fig. 3; and Fig. 3 is an exploded perspective view of the supporting structure shown in Fig. 1.

Referring to the drawing, we have shown a dynamo-electric machine provided with a ro tatable member or armature HJ having a suitable winding connected to a commutator H and arranged within a stationary member 2. The stationary member is provided with a frame i2 to which an armature bearing supporting frame is secured which is provided with two axially extending arms l3 which are adapted to support a brush rigging associated with the commutator H. The pair of arms 13 is formed with an arcuate circumferentially extending groove l4 adjacent the end of each arm, and these grooves are arranged diametrically opposite each other such that the outer ends 55 of these grooves are on a shorter chord than other points thereof. Thus, the distance between the centers of these grooves is greater than the distance between adjacent corresponding ends of the grooves, The brush rigging is provided with a supporting structure which includes arcuate supporting members 56 formed of a slightly flexible insulating material and provided with arouate end portions l1 formed with an outer curvature complementary to the grooves M. Certain corresponding points on opposite arcuate portions, such as the outer ends I8 of the arcuate portions H, are formed on a longer chord than the outer ends l5 of the grooves It, as the distance between the outer ends 18 corresponds to the distance between the centers of the grooves M. In order to place the supporting member It with the arcuate section ll within the grooves I4, it is necessary to bend or snap the member l6 slightly to provide for the insertion of the ends I8 within the ends l5 of the grooves l4. With such a construction the supporting member is held against accidental displacement from the grooves M in the supporting arms l3 as the member 16 cannot be Withdrawn from the grooves l4 without flexing it to bring the ends l8 of the member toward each other a distance less than the chord between the ends 15 of the arcuate grooves i4. Furthermore, since chords between corresponding points in the grooves Hi on either side of the center thereof are less than a chord between the central points of the grooves, the supporting members IE will tend to remain in a centered position within the grooves. However, in order to assure further against the displacement of the supporting member 56, pro- P jections l9 are formed adjacent the ends of the arcuate portions H for limiting the insertion of the supporting member into the grooves A pair of these supporting structures is arranged in diametrically opposed positions in the grooves l4, and a bearing supporting end plate 28 is formed integral with the ends of the arms I3. This plate 20 also is used to prevent chattering of the supporting structure, and a resilient spring 2| is arranged across the outer side of the plate 20 and is formed with a clamping section 22 adjacent each end thereof arranged in en gagement with a slot 23 formed in the outer central portion of each of the supporting structures l6 and thereby rigidly secures the supporting structures [6 in position Within the slots i4 and prevents axial chattering of the supporting structure by its pressure against the plate 26.

In order to support a current contact brush by the brush rigging, a substantially rectangular brush holder guiding element 2 is secured to each of the supporting members l6 by a plate 25 fastened to the supporting structure it by a pair of rivets 2S and 2'1. The rivet 26 is formed with a bifurcated end 28 which projects beyond the plate 25 and in which an end of a brush biasing spring 29 is adapted to be secured. This brush biasing spring is provided with a contact end 33 arranged to engage a suitable contact brush 3| within the brush holder guide 2 3. The electrical connections to the brush holder from rivet 26 and to the contact brush 3i and isadapted to minimize the electric current carried by the biasing spring'29. This entire brush rigging is enclosed by an end. cover 35 arranged over the arms it of bearing end frame in order to exclude foreign substances from the interior.

of the motor and is secured to the frame plate 20 by screws 36 which threadedly engage openings in the arms l3.

While we have illustrated and described a particular embodiment of our invention, modifications thereof will occur to those skilled in the art. We desire it to be understood, therefore, that our invention is not to be limited to the particular arrangement disclosed, and we intend in the appended claims to cover all modifications which do not depart from the spirit and scope of our invention.

What we claim as new and desire to secure by Letters Patent of the United States is:

l. A dynamo-electric machine member supporting structure including a pair of mounting elements having arcuate grooves therein with the outer ends of the pair of grooves formed on a shorter chord than other points thereon, and a slightly flexible supporting member having arcuate end portions arranged in engagement with said grooves and constructed complementary to a portion of said arcuate grooves with the outer ends of said arcuate end portions formed on a longer chord than the chord between the outer ends of said grooves.

2. A dynamo-electric machine member supporting structure including a mounting element having a pair of arcuate grooves therein with the outer ends of the pair of grooves formed on a shorter chord than other points thereon, and a slightly flexible supporting member having arcuate portions arranged in engagement with said grooves and constructed complementaryto a pore tion of said arcuate grooves with'certain corresponding points of said arcuate portions formed on a longer chord than the chord between the outer ends of said grooves.

3. A brush rigging including a pair of mounting elements having arcuate grooves therein with the outer ends of the pair of grooves formed on a shorter chord than other points thereon, a slight- 1y flexible supporting member having arcuate end portions arranged in engagement with said grooves and constructed complementary to a portion of said arcuate grooves with the outer ends of said arcuate end portions formed on a longer chord than the chord between the outer ends of said grooves, and a brush holder secured to said supporting member.

e. A dynamo-electric machine brush rigging including a stationary member frame having a pair of arcuate grooves in opposite sides thereof with the outer ends of the pair of grooves formed on a shorter chord than other points thereon, a slightly flexible supporting member having arcuate end portions arranged in said grooves and constructed complementary to a portion of said arcuate grooves with the outer ends of said arcuate end portions formed on a longer chord than the chord between the outer ends of said grooves, and a brush holder secured to said supporting member.

5. A dynamo-electric machine brush rigging including a stationary member frame having a pair of arcuate grooves in opposite sides thereof with the outer ends of the pair of grooves formed on a shorter chord than other points thereon, a slightly flexible supporting member having arcuate end portions arranged in engagement with said grooves and constructed complementary to a portion of said arcuate grooves with the outer ends of said arcuate end portions formed on a 7 longer chord than the chord between the outer ends of said grooves, said supporting member having projections adjacent the ends of said complementary arcuate portions for limiting the insertion of said supporting member into said grooves, and a brush holder secured to said supporting member.

6. A dynamo-electric machine brush rigging including a stationary member frame having a pair of arcuate grooves in opposite sides thereof with the outer ends of the pair of grooves formed on a shorter chord than other points thereon, a slightly flexible supporting member having arcuate end portions arranged in engagement with said grooves and constructed complementary to a portion of said arcuate grooves with the outer ends of said arcuate end portions formed on a longer chord than the chord between the outer ends of said grooves, a stiffening plate secured to said frame, and means including a retaining element for connecting said supporting member to said stiffening plate for preventing accidental removal of said supporting member from said grooves.

'7. A dynamo-electric machine brush rigging including a stationary member frame having a pair of arcuate grooves in opposite sides thereof with the outer ends of the pair of grooves formed on a shorter chord than other points thereon, a slightly flexible supporting member'having arcuate end portions arranged in engagement with said grooves and constructed complementary to a portion of said arcuate grooves with the outer ends of said arcuate end portions formed on a longer chord than the chord between the outer ends of said grooves, a stiffening plate secured to said frame, means including a resilient retaining element for biasing said supporting member into said grooves, and a brush holder secured to said supporting member.

LEROY HAIFLEY. LAWRENCE F. HENLPHILL. 

